[Cluster-devel] [fence-virt PATCH] backend plugin for monitoring a host's status

[Kazunori INOUE <inouekazu@intellilink.co.jp>]

Hi, Andrew

We (NTT) will participate in the HA Mini-Conference,
please let we explain at that time.

Best Regards

(2011/10/12 10:40), Andrew Beekhof wrote:
> Was making host connectivity information available to the guests the
> goal here or just something to demonstrate the concept?
> Interesting idea :-)
>
> 2011/10/5 Kazunori INOUE<inouekazu@intellilink.co.jp>:
>> Hi all,
>>
>> I think that the communication function of fence-virt is flexible,
>> so I want to use it more effectively.
>>
>> Therefore I made backend plugin for a guest to get the host's status
>> using the communication facility of fence-virt,
>> and I changed to allow specifying one more backend (for fencing, and
>> replying the host's status).
>>
>> I created the backend "pm-monitor" which has met the following
>> configurations / requirements.
>> - Both hosts and VMs, cluster (Pacemaker) have been configured.
>>
>> Here's an overview of function. Please refer to attached 'overview.png'.
>> (*) pingd resource notifies the status of connection with a specific
>>     host to pacemaker, and pacemaker manages the result.
>> (1) resource (vm-client) which requires the host's status is executed.
>> (2) vm-client requests 'host_status (result of pingd)' to the host
>>     with fence_virt.
>> (3) use the serial listener,
>> (4) fence_virtd (pm-monitor backend) gets the 'result of pingd' from
>>     pacemaker and answers it after conversion.
>>     - the conversion rule is set in /etc/pm-monitor.conf
>>
>> Here's a description of the attached files.
>> * add_general_backend.patch
>>   - add the server/pm-fence.c
>>   - change the configure.in and server/Makefile.in
>> * overview.png
>>   - figure of the overview.
>> * vm-client
>>   - Resource Agent for VM.
>>   - I'm going to post this RA to the appropriate community
>>     (https://github.com/ClusterLabs/resource-agents).
>> * fence_virt.conf
>>   - sample configuration.
>> * pm-monitor.conf
>>   - sample configuration for pm-monitor.so
>>
>> * host.cli, mon-host.txt
>>   - sample configuration file of a host cluster,
>>     and mon-host.txt is an output of the crm_mon command.
>> * VM.cli, mon-VM.txt
>>   - sample configuration file of a VM cluster,
>>     and mon-VM.txt is an output of the crm_mon command.
>>
>> Best Regards